Pipe-wrench.



Patented Mar. 5,1912.

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PIPE-WRENCH.

Specification of Letters Patent.

Patented Mar. 5, 1912.

Application filed November 23, 1911. Serial No. 661,907.

To all whom it may concern:

Be it known that I, AARON Snnross, a citi- Zen of the United States, residing at Ashley, in the county of Luzerne and State of Pennsylvania, have invented certain new and useful Improvements in Pipe WVrenches; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invent-ion relates to improvements in pipe wrenches, and particularly to wrenches for use in connection with smooth or polished pipes, and has for an object the arrange ment of an improved construction formed with a pair of jaws and associated with means coacting therewith for gripping a pipe sufiiciently for turning the same without marring or crushing the pipe.

Another object of the invention is the arrangement in a pipe wrench, of a stationary jaw formed with a bifurcated offset in which a handle is pivotally mounted, said handle being formed with a plurality of teeth for co-acting with an auxiliary jaw pivotally mounted on said stationary jaw in order to open and close the pivotally mounted jaw, the formation of the teeth on the handle and on the pivotally mounted jaw being such as to give a continuous increased pressure on the aws as the handle is moved for closing the aws.

A still further object of the invention is the arrangement in a wrench, of a pair of smooth jaws pivotally connected at one end, each aw having a semicircular face in combination with a handle pivotally mounted on one of the jaws formed with teeth ar ranged to engage the teeth on one of said jcws for tightening said jaws and for assisting in disengaging the aws from a pipe when the jaws are tightly clasped around the pipe.

With these and other objects in view the invention comprises certain novel constructions, combinations, and arrangement of parts as will be hereinafter more fully described and claimed.

In the accompanying drawings: Figure 1 is a side elevation of a wrench embodying the hereindescribed invention. Fig. 2 is an edge elevation thereof. Fig. 3 is a view similar to Fig. 1, the swinging jaw being open, and the handle swung to the extreme limit of its movement in one direction in relation to the fixed jaw. Fig. 4 is an edge elevation of the fixed aw, viewing the same at the side which is contiguous to the swinging jaw. Fig. 5 is an end elevation thereof. Fig. 6 is an edge elevation of the pivoted jaw, viewing the same at the side which is contiguous to the fixed jaw. Fig. 7 is an end elevation thereof.

In forming a device embodying the invention a wrench is provided having a fixed or stationary jaw l, a swinging or movable aw 2, and a pivotally mounted handle 3, the handle 3 being connected to j aw 1 by a pin 4 which is preferably tapering. The aw 1 is formed with a semicircular gripping face 5, and an offset laterally extending bifurcated portion 6, the offset portion 6 accommodating the handle 3. The inner end of handle 3 is formed with a rounded portion 7 merging into a cut-away inner end 8 which co-acts with the socket 9 of the bifurcation of the offset 6,.in order to permit the handle 3 to positively force open jaw 2. The inner end of handle 3 in effect forms a substantially circular head 10 which fits in the offset portion. The head 10 is formed with teeth 11 and 12 for engaging bearing surfaces 13 and 14 formed on jaw 2. The end of jaw 2 is in a certain sense formed with sockets 15 and 16 defining therebetween a tooth 17, the upper edge of tooth 17 forming the rounded bearing or cam surface 14, and the lower wall of socket 15 forming the rounded bearing or cam surface 13. The teeth 11 and 12 are formed with rounded or bearing surfaces which co-act with the bearing surfaces 13 and 14 for permitting an increased pressure as the jaws are being closed. The offset portion 6 and the end of jaw 2 in which sockets 15 and 16 are located, are arranged preferably to contact before the ends of the jaws 1 and 2 come together for preventing the crushing of the pipe held between the jaws. Of course it will be evident that the offset portion 6 could be set back sufficiently far as to not contact with the end of jaw 2 when the same is closed if desired so that the unrestrained pressure of the handle 3 on jaw 2 will be brought to bear against the pipe being'operated upon.

Jaws l and 2 are formed with semi-circular faces 5 and 5 so that when the jaws are closed the same will firmly grip a pipe or other article placed therein, and contact with the article for substantially the full circumference of the article. Any desired clearance may be allowed between the end of the jaw 2 and the stationary jaw 1, as well as between jaw 2 and offset portion 6 so that the jaw may be caused to firmly grip the pipe positioned in the jaws. In arranging the handle 3 in the offsetportion 6 it will be observed that the pivotal pin 4 is off a line drawn longitudinally of the stationary jaw through the center of the opening provided for the pipe or other article, the pin t being arranged eccentrically in the head 10, and thus the head 10 is eccentrically pivoted in said offset. This arrangement permits a lever or fulcrum gripping action. By arranging the handle 3 as set forth when the handle is moved pivotally for closing the jaws the cam surfaces or bearing portions on the teeth of the handle gradually move over from the front to the rear of the sockets 15 and 16, and also gradually move the center of the end of jaw 2 into a line drawn through the pivotal point of jaw 2 and pin 4.

By reason of the construction of the cutaway inner end 9 of the bifurcation of the offset 6, and the formation of the substantially circular head 10, the cut-away por tion is so positioned as to engage the handle member 3 and limit its movement to such an angle thereto as to always cause the teeth on the handle member to engage properly the sockets 15 and 16. 7

What I claim is:

1. In awrench, a handle formed with a tooth projecting therefrom, a fixed jaw pivoted upon said handle, and a swinging jaw pivoted to the fixed jaw, said swinging jaw being formed with a socket at one end thereof co-acting with the tooth on said handle, said fixed jaw having a cut-away portion so positioned as to engage said handle and limit its movement to such an angle thereto as to always cause the tooth on the handle to engage properly said socket.

2. A wrench comprising a fixed jaw having a laterally-extending bifurcated offset, the inner end of the bifurcation of said offset being cut away, a swinging jaw pivot ally connected to the fixed jaw and provided in its free end with a pair of sockets, and a handle having a substantially circular head arranged in the bifurcated offset of the stationary aw and eccentrically pivoted therein, the head of said handle being provided with a pair of teeth adapted to cooperate with the sockets of the swinging jaw to effect movement thereof upon application of pressure to the handle, the cut-away portion of the fixed jaw being so positioned as to engage said handle and limit its movement to such an angle thereto as to always cause the teeth on the handle to engage properly said sockets.

In testimony whereof I aflix my signature in presence of two witnesses.

AARON SERFOSS.

WVitnesses A. TYLER JUDsoN, MIcHAEL KILooYNE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. G. 

